Overview - ISO 2795:2020 (Plain bearings - Sintered bushes - Dimensions and tolerances)
ISO 2795:2020 sets standardized dimensions and tolerances for sintered plain bearings (sintered bushes). It covers three bearing types and their inside-diameter ranges: cylindrical bearings (1–60 mm), flanged bearings (1–60 mm) and spherical bearings (1–20 mm). The standard specifies preferred nominal sizes (outside diameter, inside diameter, length, flange dimensions), chamfers and flange radii, plus tolerance systems for as‑delivered parts and for components after fitting.
Key topics and requirements
- Scope and materials
- Applies to sintered bushes manufactured from materials conforming to ISO 5755.
- Preferred nominal dimensions
- Tables of standard sizes for cylindrical, flanged and spherical sintered bushes, including a thin‑wall series for many sizes.
- Chamfers and flange radii
- Specified chamfer dimensions relative to wall thickness and recommended flange radii by outside diameter.
- Tolerances - as‑delivered and after fitting
- Outside-diameter tolerances (e.g., r6 to s7 for D ≤ 50 mm; r7–s8 for D > 50 mm).
- Inside-diameter tolerances (e.g., F7 to G7 for D ≤ 50 mm; F8–G8 for D > 50 mm).
- Bearing length and flange thickness: js13.
- Coaxiality of outside to inside: tolerance based on D (e.g., IT9 for D ≤ 50 mm, IT10 for D > 50 mm).
- Insertion pin and housing fits: insertion pin m5–m6; housing typically H7; bearing bore after fitting H7 (D ≤ 50 mm) or H8 (D > 50 mm).
- Spherical bearings
- Inside diameter H7, spherical diameter h11, length js13; housing tolerance guidance (typically H10 or G10 for easier fit).
- Design guidance
- Sizes are selected to match common shaft diameters; same outside diameters are recommended across bearing types when possible.
- Manufacturer coordination
- As‑delivered tolerances depend on material and manufacturing method - the standard advises discussing actual tolerance combinations with the manufacturer.
Applications and users
ISO 2795:2020 is used by:
- Mechanical and design engineers specifying sintered bushes for rotating or sliding assemblies
- Bearing manufacturers and suppliers for production and quality control
- Procurement and standards compliance teams ensuring interchangeability
- Maintenance and assembly engineers selecting housing and shaft fits
Common applications: automotive components, consumer appliances, industrial machines and any application requiring low‑cost, self-lubricating sintered plain bearings.
Related standards
- ISO 5755 - Sintered metal materials - Specifications (material requirements referenced)
- ISO 286-1 / ISO 286-2 - Tolerance and fit system (referenced in bibliography for tolerance classes)
Keywords: ISO 2795:2020, plain bearings, sintered bushes, dimensions and tolerances, cylindrical bearings, flanged bearings, spherical bearings, ISO 5755, bearing tolerances.